I would suggest the lightest platinum because it defines the tiles and complements the lighter shade of the countertop.

I like the Delorean grey. I feel like the light grout makes the grout the standout instead of the tile.

The darker, it's clean & streamlined.

My hubby say's light one.

Haha we're all over the place. That's where my brain is too.

I do like dark grout sometimes with white subway. I also like it to coordinate. I still like the darker one.

I would go with one of the Delorean grey. The white grout gets to busy based on the size of the tile.

I hate the platinum and have a hard time telling the difference between the other two, so I guess Delorean grey.

I don't think the glass color ideally complements the cabinet and counter combo. so I think the light grout would mask that a bit by bringing the 3 together more with a color that is closer to the background color of the countertop.

I prefer the look of the darker grout with that particular tile, the lighter options make it appear a little busy